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Income Taxes (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss and capital loss carryforwards, state $ 38 $ 72
Net operating loss and capital loss carryforwards, foreign 122 122
Retirement and other employee benefits 51 69
State tax credits 29 69
Other 43 23
Operating lease liabilities 62 61
Gross deferred tax assets 345 416
Valuation allowance (150) (157)
Net deferred tax assets 195 259
Deferred tax liabilities:    
Depreciation and amortization (157) (204)
Investments in partnerships (998) (1,173)
Operating lease right-of-use assets (60) (60)
Other (9) (6)
Deferred tax liabilities (1,224) (1,443)
Net deferred tax liability (1,029) (1,184)
Unrecognized tax benefits:    
Balance as of January 1 81 104
Additions for tax positions taken during the current year 0 0
Additions for tax positions taken during prior years 5 0
Reductions related to lapsed statutes of limitations 0 0
Reductions related to settlements with tax jurisdictions (59) (23)
Balance as of December 31 $ 27 $ 81